Dynamic link suddenly not working!

I have the Premium collection (CS 5.5) and been using Dynamic link between Premiere and After Effects quite a lot.
Now all of a sudden it´t doesn't work! I can do the actual link but no sequenced layers as the imported comp should be, just a long clip, the media files that used to get imported along with the comp is not there either.
Also I sometimes get error messages like:
"You need production premium to use dynamic link"

One thing that works though. In AE right click and chose import Premiere Pro project.

This dynamic link thing is quite a new thing to me, the last 10 years I've been used to render everything. Usually I prefer to render out everything from AE but in this particular project it would have been noice to have since it's updated and revised all the time.

Things seem to run better if I use one software at a time, at least I don't get the error messages...

1. Cut in PrP.
2. Send desired clip to AE using DL.
3. Tweak in AE until I like it.
4. Export from AE (checking Project Link) as a movie
5. Replace AE DL clip on PrP timeline with movie.
6. If corrections are needed, use Edit Original to reopen AE project.Project Link allows this to happen.

Both AE and PP should be open, as mentioned earlier. This solved my problem. It's my first time to do cross-app workflow. It's a bit strange back-n-foth thing -- from Premier to AE, then final assembly in Premier. When I tried opening just the AE, it was freezing and crashing, then I found this solution.